Before the first show of the tour, it was reported that guitarist Jim Root would have to sit out multiple dates after his appendix had burst. On February 8, 2012, it was announced Slipknot would be returning to North America for the Mayhem Festival tour of 2012. The band scheduled three headlining shows of their own on the European leg, two shows in Russia and the latter in Berlin, Germany to compensate for the cancellation of the Bulgarian edition of the Sonisphere Festival. Corey Taylor later confirmed via Twitter that a U.S. Percussionist Shawn Crahan along with Taylor both expressed interest in bringing the tour to the United States. Taylor doubted the future of Slipknot if the upcoming shows were unsuccessful. Vocalist Corey Taylor stated that he was willing to perform the shows for the fans, but at the time was hesitant about recording another Slipknot album in the near future due to the absence of Gray and his involvement with Stone Sour. ĭrummer Joey Jordison announced that a live bassist, later confirmed as former Slipknot guitarist Donnie Steele, would fill in for Gray but would not be visible by the audience, instead performing behind Jordison. Finally, the band closed off 2011 by performing at the Rock in Rio festival held in Brazil alongside acts such as Metallica, Sepultura and others. They also headlined the Graspop Metal Meeting festival in Belgium. The band headlined the Sonisphere Festival in Finland, France, Sweden and the United Kingdom and co-headlined the festival in Greece, Turkey, Switzerland and Italy with Iron Maiden. The tour consisted mostly of festival dates and a small number of headlining appearances. The tour was the group's first since the All Hope Is Gone World Tour which ended in 2009. The Memorial World Tour was a concert tour by American heavy metal band Slipknot in honor of late bassist Paul Gray who died on May 24, 2010.

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